When the outside dose rate and the transmission factor are given, use the formula ID = TF x OD to
determine the inside dose rate. When the inside dose rate and transmission factor are known, the outside
dose rate can be determined using the formula:
Examples of the use of these formulas follow:
What is the transmission factor of a bunker when the OD is 200 cGyph and the ID is 25
Personnel will be crossing a fallout area in M1A1 Tanks. TF is 0.04 and the OD is 360
cGyph. What is the inside dose rate?
Solution: ID = TF x OD = 0.04 x 360 = 14 cGyph.
Personnel are located inside a fallout area and have taken shelter in an underground
bunker with 3 feet of earth overhead cover. The ID is 0.5 cGyph and the TF is .0002.
What is the OD?